Electric heater.



U. H, ALLEN.

ELECTRIC HEATER.

APPLICATION FILED MAY ze, 1911.

NVENTOR EN /N Patented Sept. 3, 1912.

A ltornejy UNITED sTATEs PaTENT oEEioE.

CHARLES H. ALLEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO TROY LAUNDRYMACHINERY COMPANY, LIMITED. OF CHICAGO, ILLINOIS7 A CORPORATION OF NEWYORK.

ELECTRIC HEATER.

and more particularly' to :electric heaters adapted to be used inconnection with laun dry machinery and is herein shown installed withinan ironing roll, the main object of` they invention being to provide aheater which is so constructed that greatheat will be produced with-acomparative low voltave.

t:Another object of the invention is to provide a heater which is soconstructed thaty the same can be stationarily mounted withlina rotaryironing machine, thereby overcoming the diiiiculties now existing withelectric heaters which have been heretofore used in connection withironing machines.

A further object of the -invention is to provide an electric heaterhaving a body formed of -soap-stone or any other suitable insulatingmaterial, in the periphery of which is embedded a' heating coil which7-when thrown into the circuit of'a current, will heat the entire lengthof the body toa uniform temperature in order to thoroughly heat theironing roll in-which the heater is placed.

A still further object of the invention is to provide novel means' forsecuring the lead and return wires to the heater proper whereby theheating coil will be in direct circuit with 'the source of suppl Anotherobject of the invention is to provde novel means for centering andholding the heater within the ironing roll-whereby the roll will rotatefreelyy around the heater upon suitable' bearings.

-Other and further 'objects and adi'antages of the invention will behereinafter set forth andthe novel features thereof defined by theappended claims.

'In the drawings-Figure 1 is a longitudinal section through the endportion of an ironing roll showing the application .of myimproved heaterthereto; Fig. 2 vis a Specification of Letters Patent.

`Application filed May 26, 1911.

Patented Sept. 3, 1912.4

Serial No. 629,550.

longitudinal vertical section. throughjthe ironing roll and heater, theend portions of the roll being 'broken away;'Fig.j 3is atop plan view ofthe heater detached, partly broken away; and Fig. 4 is a section takenon line 4-4 of Fig. 3.

Like numerals of reference refer to like parts in the several ligures ofthe drawings.

In the drawing# indicates an ironing rolly of any suitable.construction,but is herein shown having open ends in which are secured heads 2 havingbearing sleeves 3 which are mounted in suitable bearings 4 formed in thestandards 5 of theframe of themachine. The roll is so mounted lthat itrotates freely in the Ybearings and `at ,one end, as shown,fis providedwith a gear @for -rotating the same. The heads 2 which are arranged ateach end are secured in position by set-screws 7 in order to allow theheads to be detached or attached so as to place within the same heater 8which is the essenf tial part of my invention and which will be laterfully described.

The heater8 comprises a tubular core 9 formed of any suitable met-alhavingl its inner face covered by insulation 10 of asbestos and saidcore is adapted-to be loosely ymounted within the bearing sleeves 3 ofthe heads 2 and lat one end extends,y outwardly' as shown. The core 9 isprovided with, longitudinal slots 11 and 12 adapted to register with cutout portions 13 and 14 formed in the annular body 15 which fits snuglyonthe core and is preferably formed of soap-stone but may beformed of anyother suitable-insulating material. The periphery of. the body 15 isprovided with a spiral groove 16 iny which is embedded a resistance oi`heating wire 17 vwhich is wound therein toforln a coil1 and ispreferably formed of tungsten stee The body l5A is provided with longi--tudinal bores 1 8 in l,alinement with each other-extendingthereinffroxn each end in `which are mounted connecting plugs 20 and 21tao-which the respective ends of the heat ing coil formed bythe wire 17are connected by binding posts 22, the ends of saidwire passin throughslots formed in thebody. The p ugs are also. provided with -bindin posts23 at their ends to which are connected the ends of leadand return wires24 and 25 eter of the` groove 1n which it is seated in order to allowthe saine to expand.

The plugs 20 and 21 are held in position. by keys 26 which are forcedinto position by head plates 27 having their inner faces lined withasbestos as shown at 28 and said head plates are forced against the endof the body and locked by set nuts 29 mounted on the threaded portions30 of the core 9. By this construction, the keys and plugs can bereadily detached by removing the head plates.

ln order to allow the ironing roll to ron tate freely around the heaterand at the same time to hold the heater centrally therein, l provide theironing roll l with rings 31 carrying ball races 32 which co-act with'4balls 33 carried by ball races 34- mounted upon the core of the heaterasclearly shown, said rings being'secured in position by set screws 35in order to allow the same to be detached to install the heater therein.

From the foregoing description, it will be seen that l have provided anelectric heater comprising a body of insulating material having a spiralgroove formed in its periphery in which is seated a heating andresistance coil. 1t will also be seen vthat the ends of the heating coilare connected to plugs 'mounted in the body to which the lead and returnwires are connected, leadu ing .from any suitable. source of supply,whereby the coil, when thrown into the circuit ot a current having acomparativelyl low potential, will become lheated in the well knownmanner which, in turn, will heat the body to a uniform temperaturethroughout its length so as to give out the greatest amount ot heatpossible in order to thoroughly heat the ironing roll.

Having described my invention and set forth its merits what l claim anddesire to secure by Letters Patent is'- 1. lin electric heatercomprisingV a tubular core, a bodyol insulating material ar ranged onsaid coreyconnecting plugs detachably mounted in the opposite ends ofsaid bodya heating coil arranged around said body, la lead wireconnected to one oi:l said plugs, a return wire connected to the otheroit said plugs, said wires passing through the tubular core, and meansfor securing said plugs in position within said body.

2. An electric heater having a central tubular core provided with aninsulated inner face, said core having slots formed therein, av body ofinsulating material arranged over said core having slotsregisterinsurers ing with the slots of said core and provided. with plugsockets in communication with said slots, said body having a spiralgroove inf its periphery, detachable connecting plugs arranged in saidsockets, a heating coil arranged in said spiral groove having its endsconnected to said plugs, and' a lead wire and a' return wire extendinginto said core from one end thereof and connected respectively to saidconnecting plugs.

3. An electric heater comprisingatubular core having an insulated innerfaceand provided wit-h longitudinal slots and threaded portions, anannular body arranged on said core having a spiral groove in itsperiphery, said body being provided with plug sockets, connecting plugsarranged within said sockets, a lead wire lconnected to one of saidplugs and a return wire connected to the other plug, said :wiresextending through the slots of said core, and a heating coil ar ranged'within the groove of' said body having its ends connected respectivelyto the plugs.

4. An electric heater comprising a tubular core having an annular bodyprovided with a spiral groove in its periphery, said.

body being provided with plug sockets coinrnunicating with slots formedin said body, a heating'coil'seated in said groove, plugs mounted insaid sockets connected to the ends of said coil, lead and return wiresconnected respectively to said plugs, keys engaging said plugs, and headplates carried by said corey having insulated inner faces engaging theends of said body and said keys.

5. An electric heater comprising a tubular core having an annularbodyarranged thereon termed of insulating material, a heating` coilarranged on said body. con- 'nectinn` plugs mounted in the ends of saidbody connectedl to said coil. said connecting plugs being connectedrespectivelyeto a lead and a return wire. keys engaging said plugs. saidcore having threaded portions. and head plates arranged on the ends ofsaid body and secured in position thereon b vnuts mounted Aon thethreadedportions of said core.

6. An electric heater comprising a tubular core having threaded endportions, an annular body arranged on said core provided with a spiralgroove in its periphery, a heating coil arranged on said body in saidgroove, connecting plugsmounted 'in said body connected to therespective ends of said coil, lead and return wires connectedrespectively to said connecting plugs, head 'plates arranged on saidcorey against said body, and nuts mounted on the threaded portions ofsaid core engaging said head plates.

7. An electric heater comprising a tubular core having an insulatedinner face, an

annular body provided with spiral grooves In testimony whereof I aiix mysignature arranged on'said core, said body and core in presence of twowitnesses. bein provided with communicating s1ots,a heating coil seatedin said grooves, and lead y CHARLES H' ALLEN' 5 and return Wiresextending through the slots vWitnesses:

of said body and core and connected to the J. HOERMANN, respective endsof said coil. WM. KROGMAN.

